Your book sounds awesome - is it a cautionary tale or more of an exploration? I love science fiction. Orson Scott Card's my favourite author in the whole wide universe, and he's done a couple of really awesome post-apocalyptic stories (not exactly what you're doing but could give you some ideas). One's a set of interrelated stories/novellas called Folk of the Fringe, which is set in post-apocalyptic America, and the other one's called The Elephants of Poznan, and is set in Poland. Both very awesome and could be inspiration for you :)

The residence time for CO2 concentration in the atmosphere is ~100 years. This gives the loaded long coal train as an analogy. It is hard to get moving, but once you do get movement it is just as hard to stop it. We have movement now so it would be multiple decades before we would see any reversal even if we were stop all of the release of sequestered carbon today.

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